| 摘要 |
PURPOSE:To control a mechanism system connected to a synchronous motor stably by a method wherein the gain of speed control loop calculation is adjusted when a state in which a time interval of the change of a speed instruction signal is smaller than a certain value continues. CONSTITUTION:A CPU 10 receives a speed instruction value from an upper level CPU 9 and divides a difference between the previous value and the present value of a counter circuit 3 with a certain time to calculate a speed feedback value. Further, a speed deviation value is calculated from a difference between the speed instruction value and the speed feedback value. If a state in which a time interval of the change of the speed instruction signal is smaller than a certain value continues, the CPU 10 judges that a motor is under acceleration or deceleration and adjusts a gain for speed control loop calculation. With this constitution, even if the speed instruction signal is changed suddenly, the synchronous motor can be controlled stably without changing a mechanism system connected to the motor. |
